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Capture a TLS connection in tcpdump. What differs between the TLS 1.2 and 1.3 handshakes, and why does an ops person care?

One round trip versus two is the headline, but the ops-relevant differences hide in what stays plaintext, how resumption works, and which middlewares the change broke.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

One round trip versus two is the headline, but the ops-relevant differences hide in what stays plaintext, how resumption works, and which middlewares the change broke.

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UP NEXT ON YOUR JOURNEY

Next in this trackgRPC calls stall whenever one request retransmits. Explain head-of-line blocking in HTTP/2 and what you actually tune.Next in this trackConnections through our load balancer reset after exactly 350 seconds of silence. Where do you look and what do you tune?Next in this trackEvery connect() and every dropped SYN on a busy host, no agents installed. What can eBPF see that tcpdump cannot?

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